Re: AC_CONFIG_SUBDIRS but immediately

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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

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