Re: Wget2 cross-compile on iOS arm64

[Jeffrey Walton]

On Sun, Mar 21, 2021 at 6:41 AM Jeffrey Walton <noloader@gmail.com> wrote:
>
> Hi Everyone/Tim,
>
> I've been testing iOS cross-compiles. It looks like Wget2 is having
> trouble with arm64:
>
> $ echo $CPPFLAGS
> -DNDEBUG -isysroot
> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS8.2.sdk
>
> $ echo $CFLAGS
> -Wall -g2 -O3 -fPIC -arch arm64 -miphoneos-version-min=6 --sysroot
> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS8.2.sdk
>
> $ echo $CXXFLAGS
> -Wall -g2 -O3 -fPIC -arch arm64 -miphoneos-version-min=6
> -stdlib=libc++ --sysroot
> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS8.2.sdk
>
> $ echo $LDFLAGS
>
> $ command -v cpp
> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cpp
>
> $ cat config.log
> ...
> configure:6438: checking how to run the C preprocessor
> configure:6508: result: cpp
> configure:6528: cpp -DNDEBUG -isysroot
> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS8.2.sdk
> conftest.c
> clang: error: no input files
> configure:6528: $? = 1
> configure: failed program was:
> | /* confdefs.h */
> | #define PACKAGE_NAME "wget2"
> | #define PACKAGE_TARNAME "wget2"
> | #define PACKAGE_VERSION "1.99.2"
> | #define PACKAGE_STRING "wget2 1.99.2"
> | #define PACKAGE_BUGREPORT "bug-wget@gnu.org"
> | #define PACKAGE_URL "https://savannah.gnu.org/projects/wget";
> | #define PACKAGE "wget2"
> | #define VERSION "1.99.2"
> | /* end confdefs.h.  */
> | #ifdef __STDC__
> | # include <limits.h>
> | #else
> | # include <assert.h>
> | #endif
> |                    Syntax error
> configure:6528: cpp -DNDEBUG -isysroot
> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS8.2.sdk
> conftest.c
> clang: error: no input files
> configure:6528: $? = 1
> configure: failed program was:
> | /* confdefs.h */
> | #define PACKAGE_NAME "wget2"
> | #define PACKAGE_TARNAME "wget2"
> | #define PACKAGE_VERSION "1.99.2"
> | #define PACKAGE_STRING "wget2 1.99.2"
> | #define PACKAGE_BUGREPORT "bug-wget@gnu.org"
> | #define PACKAGE_URL "https://savannah.gnu.org/projects/wget";
> | #define PACKAGE "wget2"
> | #define VERSION "1.99.2"
> | /* end confdefs.h.  */
> | #ifdef __STDC__
> | # include <limits.h>
> | #else
> | # include <assert.h>
> | #endif
> |                    Syntax error
> configure:6558: error: in `/Users/jwalton/wget2-1.99.2':
> configure:6560: error: C preprocessor "cpp" fails sanity check
> See `config.log' for more details

Thanks Tim and Ryan.

It looks like  this is an Autotools problem. Autotools should test if
ccp works as expected, and avoid cpp if it does not. Autotools should
not break the build.

Perl works around Apple's cpp:
https://github.com/Perl/perl5/blob/blead/hints/darwin.sh#L131.

Jeff