Slang and many of it's surrounding libraries use premake.
This directory holds binaries for premake. For windows, macos and linux it is possible to use the premake binaries that are downloadable directly from the premake download page.
slang-pack uses the http module in premake to download packages. It is common for packages to be located at https based urls. For https to work premake needs
to verify certificates, by using a 'certificate bundle'. By default premake is built using /etc/ssl/cert.pem as the package bundle location.
Unfortunately this doesn't appear to work some linux versions. For example CentOS 7, has it's certificates located at /etc/ssl/certs/ca-bundle.crt.
Normal premake builds do not allow for specifying where certificates are located. To work around this problem we build a special version of
premake which requires the certificate bundle to be specified in the CURL_CA_BUNDLE environment parameter. This binary is in the centos-7-x64 directory.
The binary is built for CentOS 7 because this linux distro initially had the problem, and also because CentOS 7 binaries have a high success of working
across other distros.
Note that the CURL_CA_BUNDLE must be specified for CentOS 7 binary otherwise downloads via https will cause an error of the form:
Error: .../external/slang-binaries/lua-modules/slang-pack.lua:190: Unable to download 'https://github.com/shader-slang/slang-llvm/releases/download/v13.x-19/slang-llvm-v13.x-19-linux-x86_64-release.zip'
SSL peer certificate or SSH remote key was not OK
Cert verify failed: BADCERT_NOT_TRUSTED
code:0.0
If the certificate bundle is located in the file /etc/ssl/certs/ca-bundle.crt premake can be invoked by first setting the CURL_CA_BUNDLE as shown below
export CURL_CA_BUNDLE=/etc/ssl/certs/ca-bundle.crt
premake5 gmake --deps=true
First download the premake source this package will have the projects in a state ready to build.
In build/gmake2.unix directory, first we want to add -std=c99 in the file mbedtls-lib.make
ALL_CPPFLAGS += $(CPPFLAGS) -MMD -MP $(DEFINES) $(INCLUDES) -std=c99
Without this change building mbedtls fails.
Now we want to CURL_CA_BUNDLE specify the certificate bundle. Edit curl-lib.make and replace all of (there are more than one)
-DCURL_CA_BUNDLE=\"/etc/ssl/cert.pem\"
with
-DCURL_WANTS_CA_BUNDLE_ENV
Now we can build build premake with:
make config=release
You should now have binaries in the path from the root of `bin/release'.
Certificates that are known to work correctly on linux with premake are located in slang-binaries repo in the file certificate/linux/ca-bundle.crt.
This certificate bundle is from CentOS 7, and may need to be updated if certificates change.
For example from the slang root, with slang-binaries submodule
export CURL_CA_BUNDLE=external/slang-binaries/certificate/linux/ca-bundle.crt
premake gmake --deps=true