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| author | Bruno Haible <bruno@clisp.org> | 2020-01-18 19:02:19 +0100 |
|---|---|---|
| committer | Bruno Haible <bruno@clisp.org> | 2020-01-18 19:02:19 +0100 |
| commit | cee130f4dcfcd73385581e00c746eb1084cf9008 (patch) | |
| tree | 0dee4aa381eaeb8473ad35e7cf7184381fe5ffb4 /m4 | |
| parent | 402ad3f07567fed0e3a3839d184088628d78df07 (diff) | |
| download | gnulib-cee130f4dcfcd73385581e00c746eb1084cf9008.tar.gz | |
Avoid error "m4_require: circular dependency of AC_LANG_COMPILER(C)".
Reported by Mats Erik Andersson <mats.andersson@gisladisker.se> in
<https://lists.gnu.org/archive/html/bug-gnulib/2020-01/msg00109.html>.
* m4/00gnulib.m4 (gl_COMPILER_CLANG): Use _AC_COMPILE_IFELSE, not
AC_EGREP_CPP.
Diffstat (limited to 'm4')
| -rw-r--r-- | m4/00gnulib.m4 | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/m4/00gnulib.m4 b/m4/00gnulib.m4 index 36304b933d..90e7e04169 100644 --- a/m4/00gnulib.m4 +++ b/m4/00gnulib.m4 @@ -1,4 +1,4 @@ -# 00gnulib.m4 serial 6 +# 00gnulib.m4 serial 7 dnl Copyright (C) 2009-2020 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, @@ -58,13 +58,18 @@ AC_DEFUN([gl_COMPILER_CLANG], dnl AC_REQUIRE([AC_PROG_CC]) AC_CACHE_CHECK([whether the compiler is clang], [gl_cv_compiler_clang], - [AC_EGREP_CPP([barfbarf],[ -#ifdef __clang__ -barfbarf -#endif - ], - [gl_cv_compiler_clang=yes], - [gl_cv_compiler_clang=no]) + [dnl Use _AC_COMPILE_IFELSE instead of AC_EGREP_CPP, to avoid error + dnl "circular dependency of AC_LANG_COMPILER(C)" if AC_PROG_CC has + dnl not yet been invoked. + _AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM([[ + #ifdef __clang__ + barfbarf + #endif + ]],[[]]) + ], + [gl_cv_compiler_clang=no], + [gl_cv_compiler_clang=yes]) ]) ]) AC_DEFUN([gl_COMPILER_PREPARE_CHECK_DECL], |