gcc-wrapper.c

/*	Copyright 2015-2022 Rivoreo

	Permission is hereby granted, free of charge, to any person obtaining
	a copy of this software and associated documentation files (the
	"Software"), to deal in the Software without restriction, including
	without limitation the rights to use, copy, modify, merge, publish,
	distribute, sublicense, and/or sell copies of the Software, and to
	permit persons to whom the Software is furnished to do so, subject to
	the following conditions:

	The above copyright notice and this permission notice shall be
	included in all copies or substantial portions of the Software.

	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	NONINFRINGEMENT. IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE
	FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
	CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
	WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

//#define GCC_INSTALL_PREFIX "/opt/gcc.3.3"
//#define GCC_INSTALL_PREFIX "/opt/toolchains"
//#define GCC_INSTALL_PREFIX "/usr/sfw"
#define GCC_INSTALL_PREFIX "/usr/local"
//#define GCC_INSTALL_PREFIX "/usr"
//#define GCC_INSTALL_PREFIX "/media/f01a9cd1-2570-4619-b4cd-41a27bdcfbd3/arm-linux-gnueabi-gcc/4.3.2"
//#define GCC_INSTALL_PREFIX "/media/f01a9cd1-2570-4619-b4cd-41a27bdcfbd3/arm-linux-androideabi-gcc/4.4.3"
//#define GCC_INSTALL_PREFIX "/opt/arm-linux-gnueabi-gcc/4.5.2"

// Platform string prepend to the command name, optional
//#define GCC_PLATFORM_PREFIX "arm-none-linux-gnueabi"
//#define GCC_PLATFORM_PREFIX "arm-linux-gnueabi"
//#define GCC_PLATFORM_PREFIX "arm-linux-uceabi"
//#define GCC_PLATFORM_PREFIX "arm-linux-androideabi"
//#define GCC_PLATFORM_PREFIX "arm-unknown-freebsd11eabihf"
//#define GCC_PLATFORM_PREFIX "arm-linux-gnueabihf"
//#define GCC_PLATFORM_PREFIX "i386-pc-solaris2.10"
//#define GCC_PLATFORM_PREFIX "i386-pc-solaris2.11"
//#define GCC_PLATFORM_PREFIX "i386-linux-gnu"
//#define GCC_PLATFORM_PREFIX "i486-linux-gnu"
//#define GCC_PLATFORM_PREFIX "i686-linux-gnu"
//#define GCC_PLATFORM_PREFIX "i686-pc-cygwin"
#define GCC_PLATFORM_PREFIX "x86_64-unknown-freebsd10"
//#define GCC_PLATFORM_PREFIX "powerpc-unknown-linux-gnu"

// GCC version string append to the command name, optional
//#define GCC_VERSION_SUFFIX "3.4.3"
//#define GCC_VERSION_SUFFIX "4.3.2"
//#define GCC_VERSION_SUFFIX "4.4.3"
//#define GCC_VERSION_SUFFIX "4.5"
//#define GCC_VERSION_SUFFIX "4.7.3"
#define GCC_VERSION_SUFFIX "4.7.4"

#define _ALL_SOURCE
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#if defined __CYGWIN__ && !defined NO_CYGWIN_OUTPUT_FILE_NAME_HACK
#include <sys/stat.h>
#include <sys/wait.h>
#include <errno.h>
#endif

#ifdef EXTRA_FLAGS
static char *extra_flags[] = { EXTRA_FLAGS };
#endif

#if defined __CYGWIN__ && !defined NO_CYGWIN_OUTPUT_FILE_NAME_HACK
static int get_last_dot(const char *s, size_t len) {
	while(--len) {
		if(s[len] == '.') break;
		if(s[len] == '/' || s[len] == '\\') return -1;
	}
	if(!len) return -1;
	return len;
}

static int wait_and_rename_output_file(pid_t pid, const char *program, const char *exe_name, const char *output_file_name) {
	struct stat st;
	int status;
	while(waitpid(pid, &status, 0) < 0) {
		if(errno == EINTR) continue;
		perror("waitpid");
		return 1;
	}
	if(WIFSIGNALED(status)) {
		fprintf(stderr, "program %s terminated by signal %d\n", program, WTERMSIG(status));
		return WTERMSIG(status) + 128;
	}
	if(status) return WEXITSTATUS(status);

	if(stat(exe_name, &st) < 0) return 0;
	if(rename(exe_name, output_file_name) < 0) {
		perror("rename");
		return 1;
	}
	return 0;
}
#endif

int main(int argc, char **argv) {
#if defined __CYGWIN__ && !defined NO_CYGWIN_OUTPUT_FILE_NAME_HACK
	const char *output_file_name = NULL;
#endif
	char **p = argv;
	while(*++p) {
		if(strncmp(*p, "-R", 2) == 0) {
#ifdef ALLOW_RPATH_ORIGIN
			const char *o = (*p)[2] ? *p + 2 : ({ if(!*++p) break; *p; });
			if(strcmp(o, "$ORIGIN")) {
				fprintf(stderr, "%s: error: only '$ORIGIN' is allowed as rpath\n", argv[0]);
				return 1;
			}
#else
			fprintf(stderr, "%s: error: option '-R' is not available\n", argv[0]);
			return 1;
#endif
		} else if(strncmp(*p, "-Wl,", 4) == 0 || strcmp(*p, "-Xlinker") == 0) {
			const char *sp = (*p)[1] == 'W' ? *p + 4 : ({ if(!*++p) break; *p; });
#ifdef ALLOW_RPATH_ORIGIN
			unsigned int opt_len;
			if((strncmp(sp, "-R", 2) == 0 && (opt_len = 2)) ||
			   (strncmp(sp, "--rpath", 7) == 0 && (opt_len = 7)) ||
			   (strncmp(sp, "-rpath", 6) == 0 && (opt_len = 6))) {
				const char *o = (sp == *p) ?
					(sp[opt_len] ? (sp + opt_len) : ((*++p && strcmp(*p, "-Xlinker") == 0 && *++p) ? (*p) : ({ if(!*p) break; ""; }))) :
					sp[opt_len] ? (sp + opt_len + (sp[opt_len] == ',')) : (*++p && strncmp(*p, "-Wl,", 4) == 0 ? *p + 4 : "");
				if(strcmp(o, "$ORIGIN")) {
					fprintf(stderr, "%s: error: only '$ORIGIN' is allowed as rpath\n", argv[0]);
					return 1;
				}
			}
#else
			if(strncmp(sp, "-R", 2) == 0 || strncmp(sp, "--rpath", 7) == 0 || strncmp(sp, "-rpath", 6) == 0) {
				fprintf(stderr, "%s: error: passing rpath to the linker is not allowed\n", argv[0]);
				return 1;
			}
#endif
		}
#if defined __CYGWIN__ && !defined NO_CYGWIN_OUTPUT_FILE_NAME_HACK
		else if(strncmp(*p, "-o", 2) == 0) {
			output_file_name = (*p)[2] ? *p + 2 : ({ if(!*++p) break; *p; });
		}
#endif
	}
	const char *rpath_in_env = getenv("LD_RUN_PATH");
	if(rpath_in_env) {
		fprintf(stderr, "%s: warning: clearing environment variable LD_RUN_PATH='%s'\n", argv[0], rpath_in_env);
		unsetenv("LD_RUN_PATH");
	}
	size_t argv0_len = strlen(argv[0]);
	char *program = GCC_INSTALL_PREFIX "/bin/"
#ifdef GCC_PLATFORM_PREFIX
		GCC_PLATFORM_PREFIX "-"
#endif
		"gcc"
#ifdef GCC_VERSION_SUFFIX
		"-" GCC_VERSION_SUFFIX
#endif
		;
	if(argv0_len > 2) {
		if(strcmp(argv[0] + (argv0_len - 3), "g++") == 0) {
			program = GCC_INSTALL_PREFIX "/bin/"
#ifdef GCC_PLATFORM_PREFIX
				GCC_PLATFORM_PREFIX "-"
#endif
				"g++"
#ifdef GCC_VERSION_SUFFIX
				"-" GCC_VERSION_SUFFIX
#endif
				;
		} else if(argv0_len > 7 && strcmp(argv[0] + (argv0_len - 8), "gfortran") == 0) {
			program = GCC_INSTALL_PREFIX "/bin/"
#ifdef GCC_PLATFORM_PREFIX
				GCC_PLATFORM_PREFIX "-"
#endif
				"gfortran"
#ifdef GCC_VERSION_SUFFIX
				"-" GCC_VERSION_SUFFIX
#endif
				;
		} else if(strcmp(argv[0] + (argv0_len - 3), "gcj") == 0) {
			program = GCC_INSTALL_PREFIX "/bin/"
#ifdef GCC_PLATFORM_PREFIX
				GCC_PLATFORM_PREFIX "-"
#endif
				"gcj"
#ifdef GCC_VERSION_SUFFIX
				"-" GCC_VERSION_SUFFIX
#endif
				;
		}
	}
#if defined __CYGWIN__ && !defined NO_CYGWIN_OUTPUT_FILE_NAME_HACK
	if(output_file_name) {
		size_t len = strlen(output_file_name);
		//output_file_name = getbasename(output_file_name);
		//if(!strchr(output_file_name, '.')) {
		if(get_last_dot(output_file_name, len) == -1) {
			struct stat st;
			char exe_name[len + 4 + 1];
			memcpy(exe_name, output_file_name, len);
			strcpy(exe_name + len, ".exe");
			if(lstat(exe_name, &st) == 0 && !S_ISREG(st.st_mode) && !S_ISDIR(st.st_mode)) {
				fprintf(stderr, "error: redirected output file %s exists and it is not a regular file\n", exe_name);
				return 1;
			}
			pid_t pid = fork();
			if(pid > 0) {
				// fork(2) successed and this is the parent process
				return wait_and_rename_output_file(pid, program, exe_name, output_file_name);
			}
		}
	}
#ifdef CYGWIN_HACK_A_EXE
	else {
		struct stat st;
		if(lstat("a.out", &st) == 0 && !S_ISREG(st.st_mode)) {
			fprintf(stderr, "error: a.out: %s\n", strerror(EEXIST));
			return 1;
		}
		pid_t pid = fork();
		if(pid > 0) return wait_and_rename_output_file(pid, program, "a.exe", "a.out");
	}
#endif
#endif
#ifdef EXTRA_FLAGS
	//[argc + (sizeof extra_flags / sizeof *extra_flags) + 1]
	char **new_argv = malloc(argc * sizeof(char *) + sizeof extra_flags);
	if(!new_argv) {
		fputs("error: out of memory\n", stderr);
		return 1;
	}
	new_argv[0] = program;
	memcpy(new_argv + 1, extra_flags, sizeof extra_flags);
	memcpy(new_argv + 1 + (sizeof extra_flags / sizeof *extra_flags), argv + 1, argc * sizeof(char *));
	execv(program, new_argv);
	free(new_argv);
#else
	argv[0] = program;
	execv(program, argv);
#endif
	perror(program);
	return 2;
}