On 11 November 2015 at 16:51, Gavin Smith <gavinsmith0123@xxxxxxxxx> wrote: > It also needs to be resilient against failure of the subsidiary > configure script. This happened due to the AC_PROG_CC macro > discovering that the C compiler didn't exist, or didn't work. This > compiler was the one that that Perl said it was compiled with (output > of "perl -V:cc"), so it's quite possible for it not to exist or not > work. So about this. I simulated this failure by putting CC=xxxxxxxxxxxx in the subsidiary configure script. This leads to an error message: checking for gcc... xxxxxxxxxxxx checking whether the C compiler works... no configure: error: in `/home/g/src/texinfo/PROJ_SVN/tp/Texinfo/Convert/XSParagraph': configure: error: C compiler cannot create executables I tried to get rid of this failure by removing the use of AC_PROG_CC, but it made no difference, probably because some other macro does AC_REQUIRE([AC_PROG_CC]). Doing the following in the top-level configure script appeared to work well, though: save_subdirs=$subdirs subdirs=tp/Texinfo/Convert/XSParagraph ( _AC_OUTPUT_SUBDIRS) || echo XXXXXXXXXXXXXXXXXXXXXXXXXfailure subdirs=$save_subdirs Doing the configuration inside a subshell insulates from the failure. Sample output. checking whether to use NLS... yes checking where the gettext function comes from... libc === configuring in tp/Texinfo/Convert/XSParagraph (/home/g/src/texinfo/PROJ_SVN/tp/Texinfo/Convert/XSParagraph) configure: running /bin/sh ./configure --disable-option-checking '--prefix=NONE' 'CFLAGS=-Wdeclaration-after-statement -g -O0 -Wunused -Wimplicit-function-declaration -Wreturn-type' --cache-file=/dev/null --srcdir=. checking for a BSD-compatible install... /usr/bin/ginstall -c checking whether build environment is sane... yes checking for a thread-safe mkdir -p... /usr/bin/mkdir -p checking for gawk... gawk checking whether make sets $(MAKE)... yes checking whether make supports nested variables... yes checking for perl... /usr/bin/perl checking Perl configuration value cc... cc checking for style of include used by make... GNU checking for gcc... xxxxxxxxxxxx checking whether the C compiler works... no configure: error: in `/home/g/src/texinfo/PROJ_SVN/tp/Texinfo/Convert/XSParagraph': configure: error: C compiler cannot create executables See `config.log' for more details configure: error: ./configure failed for tp/Texinfo/Convert/XSParagraph XXXXXXXXXXXXXXXXXXXXXXXXXfailure checking whether we can build Perl extension modules... configure: error: in `/home/g/src/texinfo/PROJ_SVN/tp/Texinfo/Convert/XSParagraph': configure: error: C compiler cannot create executables See `config.log' for more details make: *** [config.status] Error 77 no checking for prove... prove checking parser tests requirements... yes checking Perl Texinfo API texinfo documentation build requirements... yes and as you can see the configure script continues on after the failure. Taking the subshell out, the top-level configure script fails after trying to configure the subdirectory. configure.ac excerpt: save_subdirs=$subdirs subdirs=tp/Texinfo/Convert/XSParagraph _AC_OUTPUT_SUBDIRS subdirs=$save_subdirs End of configure output: checking whether to use NLS... yes checking where the gettext function comes from... libc === configuring in tp/Texinfo/Convert/XSParagraph (/home/g/src/texinfo/PROJ_SVN/tp/Texinfo/Convert/XSParagraph) configure: running /bin/sh ./configure --disable-option-checking '--prefix=NONE' 'CFLAGS=-Wdeclaration-after-statement -g -O0 -Wunused -Wimplicit-function-declaration -Wreturn-type' --cache-file=/dev/null --srcdir=. checking for a BSD-compatible install... /usr/bin/ginstall -c checking whether build environment is sane... yes checking for a thread-safe mkdir -p... /usr/bin/mkdir -p checking for gawk... gawk checking whether make sets $(MAKE)... yes checking whether make supports nested variables... yes checking for perl... /usr/bin/perl checking Perl configuration value cc... cc checking for style of include used by make... GNU checking for gcc... xxxxxxxxxxxx checking whether the C compiler works... no configure: error: in `/home/g/src/texinfo/PROJ_SVN/tp/Texinfo/Convert/XSParagraph': configure: error: C compiler cannot create executables See `config.log' for more details configure: error: ./configure failed for tp/Texinfo/Convert/XSParagraph _______________________________________________ Autoconf mailing list Autoconf@xxxxxxx https://lists.gnu.org/mailman/listinfo/autoconf
